// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.firebase.firestore.remote;

import androidx.annotation.NonNull;
import io.grpc.Metadata;

/**
 * Class updates the headers for the request to the backend.
 *
 * <p>UpdateMetadata updates the metadata object with some custom headers which will be sent along
 * with the default headers to the backend.
 */
public interface GrpcMetadataProvider {

  void updateMetadata(@NonNull Metadata metadata);
}
